ARM: dts: BCM5301X: provide address for SoC MACs on ASUS RT-AC3100 & AC88U

Do not leave the providing of a MAC address for an SoC MAC to a driver.
Describe it on the bindings. Provide a distinct MAC address for each SoC
MAC.

Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Link: https://lore.kernel.org/r/20240414-for-soc-asus-rt-ac3100-improvements-v1-2-0e40caf1a70a@arinc9.com


Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>